feat(cache): implement a simple caching mechanism with TTL and prefix invalidation

refactor(expenses): integrate caching for periodic expenses and related operations
refactor(quotes): add caching for quotes retrieval and history endpoints

apps/backend/src/index.ts

@@ -7,6 +7,8 @@ import { startQuoteJob } from "./modules/quotes/quote.job";
 import quotesRouter from "./modules/quotes/quotes.routes";
 import expensesRouter from "./modules/expenses/expenses.routes";
 import { startExpenseJob } from "./modules/expenses/expense.job";
+import { cache } from "./lib/cache";
+import { eventBus } from "./lib/event-bus";
 import { logger } from "./lib/logger";
 
 const app = new Hono();
@@ -32,6 +34,10 @@ app.route("/api", expensesRouter);
 app.use("/assets/*", serveStatic({ root: "./web" }));
 app.get("*", serveStatic({ path: "./web/index.html" }));
 
+eventBus.on("quotes-updated", () => {
+  cache.invalidateByPrefix("quotes:");
+});
+
 startQuoteJob();
 startExpenseJob();